Criminal Code Warning: this is not an official translation. Under all circumstances the original text in Dutch language of the Criminal Code (Wetboek van Strafrecht) prevails

Section 27 
1.   In cases where the convicted offender has spent time in police custody, pre-trial detention or has 
been detained for failure to comply with a judicial order under section 578b of the Code of 
Criminal Procedure or has spent time in a psychiatric hospital or an institution intended for clinical 
observation under an observation order or in detention abroad in response to an application for 
extradition or surrender from the Netherlands, the court, when imposing a determinate term of 
imprisonment, detention or community service, shall order deduction of this total period of time 
already served, prior to enforcement of the judgment, from this sentence to be enforced. If the 
court issues this order with regard to community service, it shall set the criteria for deduction in its 
judgment. The foregoing shall not apply insofar as this period of time has already been deducted 
from the term of another custodial sentence served by the convicted offender under section 68(1, 
last sentence) of the Code of Criminal Procedure.  
2.   In the calculation of the period of time to be deducted, the first day of police custody shall count 
as a whole day and the day of its termination shall not be taken into account. 
3.   In the imposition of a fine, the court may issue a similar order. If the court issues such an order, it 
shall establish the criteria for deduction in its judgment. 
4.   The preceding subsections of this section shall also apply in cases where, in the case of the 
concurrent prosecution of two or more offences, the sentence is imposed for an offence other than 
the offence for which police custody, pre-trial detention or detention for failure to comply with a 
judicial order under section 578b of the Code of Criminal Procedure is ordered. 
Section 27a 
The time the convicted offender sentenced to imprisonment or detention has spent in detention abroad 
in response to an application for extradition from the Netherlands for the purpose of enforcement or 
continued enforcement of this punishment, shall be deducted from the term of this punishment. 
Section 27bis [Repealed as of 01-07-1965] 
 
Section 27ter [Repealed as of 01-07-1965] 
 
Section 27quater [Repealed as of 01-07-1965]